Most Likely Not: The Stuxnet computer worm infected its first computer through a flash drive. Once the first computer was infected, the worm could then install itself on all of the other computers on the same network. It was able to do all of this while remaining undetected. By the time if was finally detected, it is predicted that thousands of machines had been infected. This may seem like a big number but consider how many computers there are in the world right now. However, the worm was very particular in choosing which machines it chose to affect.
From the video, the narrator stated that Stuxnet targeted the centrifuges that spin nuclear material at Iran's enrichment facilities and after the attack, the virus shut down about 1000 centrifuges. There is no evidence that who did it. However, the government of Iran pointed out that the attackers were U.S. and Israel governments. It was an armed attack since Stuxnet was considered as a weapon and physically damaged lots of centrifuges in Iran's. However, we just assume that U.S. and Israel did it without physical evidence. Could we say this attack was illegal at this point?